public class Example{
  String str=new String("good");
  char[]ch={'a','b','c'};
  public static void main(String args[]){
    Example ex=new Example();
    ex.change(ex.str,ex.ch);
    System.out.print(ex.str+" and ");
    System.out.print(ex.ch);
    String s = "Example";
    s=s+10;
    System.out.println(s);
    String s1="abc";
    String s2="abc";
    System.out.println(s1==s2);
    System.out.println(s1.equals(s2));
  }
  public void change(String str,char ch[]){
    str="test ok";
    ch[0]='g';
  }
}